drm/i915: clear the entire sdvo infoframe buffer

Like in the case of native hdmi, which is fixed already in

commit adf00b26d18e1b3570451296e03bcb20e4798cdd
Author: Paulo Zanoni <paulo.r.zanoni@intel.com>
Date:   Tue Sep 25 13:23:34 2012 -0300

    drm/i915: make sure we write all the DIP data bytes

we need to clear the entire sdvo buffer to avoid upsetting the
display.

Since infoframe buffer writing is now a bit more elaborate, extract it
into it's own function. This will be useful if we ever get around to
properly update the ELD for sdvo. Also #define proper names for the
two buffer indexes with fixed usage.

v2: Cite the right commit above, spotted by Paulo Zanoni.

v3: I'm too stupid to paste the right commit.

v4: Ben Hutchings noticed that I've failed to handle an underflow in
my loop logic, breaking it for i >= length + 8. Since I've just lost C
programmer license, use his solution. Also, make the frustrated 0-base
buffer size a notch more clear.

Reported-and-tested-by: Jürg Billeter <j@bitron.ch>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=25732
Cc: stable@vger.kernel.org
Cc: Paulo Zanoni <przanoni@gmail.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index c01d97db0061d19be180f6dbcf9cecffd505aeb0..79d308da29ff8e67cc064b94a31500c0d614a0ad 100644 (file)
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -894,6 +894,45 @@ static void intel_sdvo_dump_hdmi_buf(struct intel_sdvo *intel_sdvo)
 }
 #endif
 
+static bool intel_sdvo_write_infoframe(struct intel_sdvo *intel_sdvo,
+                                      unsigned if_index, uint8_t tx_rate,
+                                      uint8_t *data, unsigned length)
+{
+       uint8_t set_buf_index[2] = { if_index, 0 };
+       uint8_t hbuf_size, tmp[8];
+       int i;
+
+       if (!intel_sdvo_set_value(intel_sdvo,
+                                 SDVO_CMD_SET_HBUF_INDEX,
+                                 set_buf_index, 2))
+               return false;
+
+       if (!intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_HBUF_INFO,
+                                 &hbuf_size, 1))
+               return false;
+
+       /* Buffer size is 0 based, hooray! */
+       hbuf_size++;
+
+       DRM_DEBUG_KMS("writing sdvo hbuf: %i, hbuf_size %i, hbuf_size: %i\n",
+                     if_index, length, hbuf_size);
+
+       for (i = 0; i < hbuf_size; i += 8) {
+               memset(tmp, 0, 8);
+               if (i < length)
+                       memcpy(tmp, data + i, min_t(unsigned, 8, length - i));
+
+               if (!intel_sdvo_set_value(intel_sdvo,
+                                         SDVO_CMD_SET_HBUF_DATA,
+                                         tmp, 8))
+                       return false;
+       }
+
+       return intel_sdvo_set_value(intel_sdvo,
+                                   SDVO_CMD_SET_HBUF_TXRATE,
+                                   &tx_rate, 1);
+}
+
 static bool intel_sdvo_set_avi_infoframe(struct intel_sdvo *intel_sdvo)
 {
        struct dip_infoframe avi_if = {
@@ -901,11 +940,7 @@ static bool intel_sdvo_set_avi_infoframe(struct intel_sdvo *intel_sdvo)
                .ver = DIP_VERSION_AVI,
                .len = DIP_LEN_AVI,
        };
-       uint8_t tx_rate = SDVO_HBUF_TX_VSYNC;
-       uint8_t set_buf_index[2] = { 1, 0 };
        uint8_t sdvo_data[4 + sizeof(avi_if.body.avi)];
-       uint64_t *data = (uint64_t *)sdvo_data;
-       unsigned i;
 
        intel_dip_infoframe_csum(&avi_if);
 
@@ -915,22 +950,9 @@ static bool intel_sdvo_set_avi_infoframe(struct intel_sdvo *intel_sdvo)
        sdvo_data[3] = avi_if.checksum;
        memcpy(&sdvo_data[4], &avi_if.body, sizeof(avi_if.body.avi));
 
-       if (!intel_sdvo_set_value(intel_sdvo,
-                                 SDVO_CMD_SET_HBUF_INDEX,
-                                 set_buf_index, 2))
-               return false;
-
-       for (i = 0; i < sizeof(sdvo_data); i += 8) {
-               if (!intel_sdvo_set_value(intel_sdvo,
-                                         SDVO_CMD_SET_HBUF_DATA,
-                                         data, 8))
-                       return false;
-               data++;
-       }
-
-       return intel_sdvo_set_value(intel_sdvo,
-                                   SDVO_CMD_SET_HBUF_TXRATE,
-                                   &tx_rate, 1);
+       return intel_sdvo_write_infoframe(intel_sdvo, SDVO_HBUF_INDEX_AVI_IF,
+                                         SDVO_HBUF_TX_VSYNC,
+                                         sdvo_data, sizeof(sdvo_data));
 }
 
 static bool intel_sdvo_set_tv_format(struct intel_sdvo *intel_sdvo)

diff --git a/drivers/gpu/drm/i915/intel_sdvo_regs.h b/drivers/gpu/drm/i915/intel_sdvo_regs.h
index 9d030142ee43476c89cf2769f0d8c75cf1697daa..770bdd6ecd9fb96b46365bbadd97ba3011c0ef96 100644 (file)
--- a/drivers/gpu/drm/i915/intel_sdvo_regs.h
+++ b/drivers/gpu/drm/i915/intel_sdvo_regs.h
@@ -708,6 +708,8 @@ struct intel_sdvo_enhancements_arg {
 #define SDVO_CMD_SET_AUDIO_STAT                0x91
 #define SDVO_CMD_GET_AUDIO_STAT                0x92
 #define SDVO_CMD_SET_HBUF_INDEX                0x93
+  #define SDVO_HBUF_INDEX_ELD          0
+  #define SDVO_HBUF_INDEX_AVI_IF       1
 #define SDVO_CMD_GET_HBUF_INDEX                0x94
 #define SDVO_CMD_GET_HBUF_INFO         0x95
 #define SDVO_CMD_SET_HBUF_AV_SPLIT     0x96